package test;

public class YootkDemo2 {
    public static void main(String[] args) throws Exception {
        StringBuffer builder = new StringBuffer(30);
        builder.append("edu.yootk.com").insert(0,"李华编程训练营");
        System.out.println(builder.replace(9,25,"www.yootk.com").delete(0,9));
    }
}
